i

Coupler® Isolated Interface

Development Environment

ezLINX™

Hardware User Guide

Rev. PrA | Page 4 of 15

Figure 3. ADM3053 Isolated CAN Implementation

ISOLATED RS-485 AND RS-422

The Isolated RS-485 and RS-422 port is implemented using the

ADM2587E Signal and Power isolated CAN transceiver. The

ADM2587E connects to UART2 of the ADSP-BF548 and is

capable of functioning at data rates of up to 500kbit/s. Figure 4

shows a circuit diagram of the implementation of the ADM3053

on the ezLINX hardware.

The RS-485 Node can be configured using jumpers JP3, JP4,

JP19 and JP40. To configure the node as a half-duplex RS-485

node, connect JP3 and JP4. When JP3 and JP4 are fitted, it will

connect A to Y and B to Z. When JP3 and JP4 are removed, the

node will be configured as a full duplex RS-485 node or as a RS-

422 node. When JP19 is fitted, the A and B pins will be

terminated with 120Ω. If termination is not required, remove

JP19. When JP40 is connected a pull-up resistor on the RxD pin

of 10kΩ will be connected. Table x show jumper configurations

for all the interfaces on ezLINX.

iso

Power isolated Power supply and iCoupler signal isolation of

the ADM2587E. This generates an isolated 3.3V on the Visoout

pin(pin 12) of the ADM2587E and is connected to the Visoin

pin(pin 19).

A six pin screw terminal connector, J7 is used for easy access to

the A(Pin 2), B(Pin 3), Z(Pin 4), Y(Pin 5) and RS-

485_ISO_GND(Pin 1 and 6) connections.

Application note AN-960 provides more information on circuit

implementation of RS-485 and RS-422 applications.